Abstract
The spindle apparatus dictates the plane of cell cleavage, which is critical in the choice between symmetric or asymmetric division. Spindle positioning is controlled by an evolutionarily conserved pathway, which involves LIN-5/GPR-1/2/Gα in Caenorhabditis elegans, Mud/Pins/Gα in Drosophila and NuMA/LGN/Gα in humans1. GPR-1/2 and Gα localize LIN-5 to the cell cortex, which engages dynein and controls the cleavage plane during early mitotic divisions in C. elegans2,3,4,5,6. Here we identify ASPM-1 (abnormal spindle-like, microcephaly-associated) as a novel LIN-5 binding partner. ASPM-1, together with calmodulin (CMD-1), promotes meiotic spindle organization and the accumulation of LIN-5 at meiotic and mitotic spindle poles. Spindle rotation during maternal meiosis is independent of GPR-1/2 and Gα, yet requires LIN-5, ASPM-1, CMD-1 and dynein. Our data support the existence of two distinct LIN-5 complexes that determine localized dynein function: LIN-5/GPR-1/2/Gα at the cortex, and LIN-5/ASPM-1/CMD-1 at spindle poles. These functional interactions may be conserved in mammals, with implications for primary microcephaly.
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Acknowledgements
We are grateful to Steve Gygi and Ross Tomaino (Taplin Biological Mass Spectrometry, Harvard Medical School) for analysis of peptides by mass spectrometry (HMS), to Sean O'Rourke and Bruce Bowerman for the GFP–DHC-1 strain EU1561, to Inge The for assistance with ASPM-1 antibody production, Kristiaan de Vries for scoring embryonic lethality, and the Caenorhabditis Genetics Center (National Institutes of Health, National Center for Research Resources) for providing strains. We thank Adri Thomas and Marjolein Wildwater for critically reading the manuscript. This work was supported in part by National Institutes of Health grant GM57990 to S.v.d.H, Swiss National Science Foundation grant 3100A0-102087 to P.G., and Marie Curie International Reintegration grant MIRG-CT-2007-046458 to M.B.
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M.v.d.V. was primarily responsible for the experiments, data analysis and manuscript writing. C.B. performed IP-western experiments and fusion protein purification. A.P. contributed in the initial phase of the project. T.N-N. and P.G. performed spindle severing assays. M.B. performed Y2H experiments with support from M.V. S.v.d.H. contributed to experimental design, supervision and manuscript writing.
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van der Voet, M., Berends, C., Perreault, A. et al. NuMA-related LIN-5, ASPM-1, calmodulin and dynein promote meiotic spindle rotation independently of cortical LIN-5/GPR/Gα. Nat Cell Biol 11, 269–277 (2009). https://doi.org/10.1038/ncb1834
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DOI: https://doi.org/10.1038/ncb1834
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